At Magic Academy: Learn to Play, players use Welcome Decks or any starter product to learn the basic rules and play their first games
Fortunately, its not going to be all that different in the analog games new digital cousin, Magic: The Gathering Arena
Any creature that cares about the number of creatures you control needs to have a way to make more on its own, and Adeline does that in spades by creating a 1/1 for each opponent you have
You can also swap them out for glass beads, six-sided dice, or bottle caps whatever you have to hand, really, works just fine
This results in the counterspell not having a legal target when it tries to resolve because Imps Mischief has already left the stack by then
Library offers a cheaper, harder-to-remove version that can turn a doomed character into a guaranteed draw